We consider an extension of the Standard Model with two right-handed singlet fermions with mass at the electroweak scale that induce neutrino masses, plus a generic new physics sector at a higher scale Λ. We focus on the effective operators of lowest dimension d = 5, which induce new production and decay modes for the singlet fermions. We assess the sensitivity of future Higgs Factories, such as FCC-ee, CLIC-380, ILC and CEPC, to the coefficients of these operators for various center of mass energies. We show that future lepton colliders can test the cut-off of the theory up to Λ ≃ 500–1000 TeV, surpassing the reach of future indirect measurements of the Higgs and Z boson widths. We also comment on the possibility of determining the underlying model flavor structure should a New Physics signal be observed, and on the impact of higher dimensional d = 6 operators on the experimental signatures.

The see-saw portal at future Higgs Factories / Barducci, D.; Bertuzzo, E.; Caputo, A.; Hernandez, P.; Mele, B.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:3(2021). [10.1007/JHEP03(2021)117]

The see-saw portal at future Higgs Factories

Barducci D.;Hernandez P.;
2021

Abstract

We consider an extension of the Standard Model with two right-handed singlet fermions with mass at the electroweak scale that induce neutrino masses, plus a generic new physics sector at a higher scale Λ. We focus on the effective operators of lowest dimension d = 5, which induce new production and decay modes for the singlet fermions. We assess the sensitivity of future Higgs Factories, such as FCC-ee, CLIC-380, ILC and CEPC, to the coefficients of these operators for various center of mass energies. We show that future lepton colliders can test the cut-off of the theory up to Λ ≃ 500–1000 TeV, surpassing the reach of future indirect measurements of the Higgs and Z boson widths. We also comment on the possibility of determining the underlying model flavor structure should a New Physics signal be observed, and on the impact of higher dimensional d = 6 operators on the experimental signatures.
2021
Beyond Standard Model; Higgs Physics; Neutrino Physics
01 Pubblicazione su rivista::01a Articolo in rivista
The see-saw portal at future Higgs Factories / Barducci, D.; Bertuzzo, E.; Caputo, A.; Hernandez, P.; Mele, B.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:3(2021). [10.1007/JHEP03(2021)117]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1578746
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